I just love joule thieves! No I didn't make a spelling mistake and no this isn't about burgulary!

A joule is a very tiny measure of electricity, and a joule theif circuit sucks out the last bits of power from a run down battery.They allow you to light LEDs from a single AA battery! No longer do you need 3 volts for one LED, you can use a single 1.5 volt battery! And if you divert the circuit two ways where you would connect the LED you can run two from one joule theif circuit and one 1 and a half volter!

This is where I found out how to make them:Joule theif video!Theres alot of different kinds of joule thief but I think this is the simplest and it is damn good!(By the by I exchanged the 1K resistor for a 0.2k [200 ohm] resistor when using two LEDs, just makes them both a bit brighter!)

Using this fantastic circuit I have made a few glowing devicesAt the moment I only have photos of my Gameboy lights:They used to eat batteries like no-ones business but now they work from one, and a run down one at that!

Spoiler:

Note: Those two are for sale! e-mail me for more info, this isn't trading!